The whole powerset of cap marvel is being powered up by 6 different gods, so yes, context implies that Cap Marvel has the potential to fight and win darkseid level threats. And the Zonuz fight happens AFTER darkseid died, so the darkseid from the battle before is not facing the same cap marvel, and Zonuz specifically repeats that he IS Yuga Khan, the father of Darkseid, planning to use the SHAZAM power to replace his fallen son once again. so it is a comparable level of villain to darkseid, considering his previous feats against his own son.

That's quite a leap in logic I'd say but looking back at this board, I'm not exactly surprised.

And no, it doesn't means Cap can beat Darkseid on his own.

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You seem to consider comic characters too one dimensionally, when there is a definite range of potential use of a character that tends to go beyond "the norm" or even the logic of powersets. Shazam is definitely on the same range of a Superman if need be.